What You Should Know About It
Torch on roofing felt is used in conjunction with membrane roofing, a flexible, membrane-like material. Membranes are usually made from synthetic rubber, thermoplastic or modified bitumen, and can be layered over an already-existing roof. When heat is applied with a torch, the underside melts, attaching it to a layer of felt beneath, and then cools into a durable, glassy coat.
It is used on buildings with flat, or nearly-flat, roofs to create a waterproof seal that prevents leaks and water damage. The seal is often stronger than an asphalt and gravel roof and it is usually easier to repair if damaged.
Because membrane roofing is easier to apply than an asphalt and gravel roof, many people install it themselves to save the cost of a roofing service. There can, however, be challenges and it is a good idea to be prepared before getting started. First of all, it is important to know local roofing laws. Some cities allow only a certain number of layers per roof, and it may be necessary to remove an old roof before applying a new one. Next, it is important to consider which material you want to use.
Synthetic rubber roofing comes in sheets that must be welded together to create one continuous slab, while sheets of thermoplastic do not require excess welding. Modified bitumen is actually made from asphalt and has a much more traditional look when finished. It is a good idea to call manufacturers and ask for roofing quotes and other information to make sure you are making an informed decision.
It is important to make sure the roof is free of obstruction and damage before starting the application process. Once your membrane is attached, it will be difficult to do any repairs underneath. 43-pound roofing felt is the first layer to be laid down. The felt should be laid in a single layer that completely covers the roof and should be nailed down at eight-inch intervals. Drip edges should be installed next, around the sides of the building, and sprayed with primer to ensure they seal properly during the heating process.
Finally, it is time to lay the layer of membrane. Position and smooth your first sheet, and then roll it back, just to the half way point. Aim your torch between the felt and the membrane, ensuring that both are partially melted. When both materials start to bubble, press them together to create a seal. Now you can roll up the other side of the membrane and repeat the process until the whole piece is attached. As you install more sheets, make sure to concentrate heat along the seams to melt them together and prevent future leaks.